Toward Understanding Environmental Effects in SDSS Clusters

Details Toward Understanding Environmental Effects in SDSS Clusters Toward Understanding Environmental Effects in SDSS Clusters

2004-11-09

arxiv.org/abs/astro-ph/0411235v1

Astron.Astrophys.439:45-58,2005

Astronomy and Astrophysics

Astrophysics

12 pages, 8 figures, submitted for Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20042347

We find clusters and superclusters of galaxies using the Data Release 1 of the Sloan Digital Sky Survey. We determine the luminosity function of clusters and find that clusters in a high-density environment have a luminosity a factor of ~5 higher than in a low-density environment. We also study clusters and superclusters in numerical simulations. Simulated clusters in a high-density environment are also more massive than those in a low-density environment. Comparison of the density distribution at various epochs in simulations shows that in large low-density regions (voids) dynamical evolution is very slow and stops at an early epoch. In contrast, in large regions of higher density (superclusters) dynamical evolution starts early and continues until the present; here particles cluster early, and by merging of smaller groups very rich systems of galaxies form.

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